Firehouse 105 is a fictional firehouse that appeared in late Season 2 and early Season 3. 2 locations for this firehouse were used. The first location (S02E22) is the quarters of Chicago Fire Department Engine 26, located at 10 N. Leavitt St. The second location (S03E02) is the quarters of Chicago Fire Department Engine 4, located at 548 W. Division St.
- Engine Co. 105
- Truck Co. 66 - 1996 Seagrave Marauder (-/-/100' rear-mount)
- Ambulance 79